/*******************************************************************************
 * Copyright (c) 2009, 2014 IBM Corp.
 * <p/>
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 * <p/>
 * The Eclipse Public License is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 * <p/>
 * Contributors:
 * Dave Locke - initial API and implementation and/or initial documentation
 */
package com.app.mingluxing.mqttsource.internal;


import com.app.mingluxing.mqttsource.MqttException;
import com.app.mingluxing.mqttsource.MqttSecurityException;

/**
 * Utility class to help create exceptions of the correct type.
 */
public class ExceptionHelper {
    public static MqttException createMqttException(int reasonCode) {
        if ((reasonCode == MqttException.REASON_CODE_FAILED_AUTHENTICATION) ||
                (reasonCode == MqttException.REASON_CODE_NOT_AUTHORIZED)) {
            return new MqttSecurityException(reasonCode);
        }

        return new MqttException(reasonCode);
    }

    public static MqttException createMqttException(Throwable cause) {
        if (cause.getClass().getName().equals("java.security.GeneralSecurityException")) {
            return new MqttSecurityException(cause);
        }
        return new MqttException(cause);
    }

    /**
     * Returns whether or not the specified class is available to the current
     * class loader.  This is used to protect the code against using Java SE
     * APIs on Java ME.
     */
    public static boolean isClassAvailable(String className) {
        boolean result = false;
        try {
            Class.forName(className);
            result = true;
        } catch (ClassNotFoundException ex) {
        }
        return result;
    }

    // Utility classes should not have a public or default constructor.
    private ExceptionHelper() {
    }
}
